# US 10,865,715 B2 · Passive stability bleed valve with adjustable reference pressure regulator and remote override capability > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,715 B2 - Document ID: US10865715B2 - Status: Granted - Kind: B2 - Application number: 16/213,381 - Filed: 2018-12-07 - Published: 2020-06-11 - Granted: 2020-12-15 - Earliest claimed: 2018-12-07 - Assignees: Raytheon Technologies Corporation - Applicants: United Technologies Corporation - Inventors: Michael D. Greenberg; Robert B. Goodman - Web page: https://patentgrep.com/patent/US10865715B2 ## CPC - F02C 9/18: by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages {(F02C3/113 takes precedence)} - F04D 27/0215: {Arrangements therefor, e.g. bleed or by-pass valves} - F05D 2220/323: for aircraft propulsion, e.g. jet engines - F05D 2260/606: Bypassing the fluid - F05D 2270/101: Compressor surge or stall - F05D 2270/65: Pneumatic actuators - Y10T 137/3421: Line condition change responsive - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A bleed air valve comprises a housing that includes an inlet, an outlet, and a center portion to selectively provide a pneumatic flow path between the inlet and the outlet. A piston moves along a center guide in response to forces applied to the piston, where the piston is spring biased to an open position. The valve also comprises a pressure regulator valve that comprises a spring loaded poppet valve that includes a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regulator piston. A valve spring applies a force to the piston first surface to spring bias the bleed air valve to the open position. A solenoid valve receives a command signal and in response provides compressed air to a solenoid valve outlet that is in fluid communication with the pressure regulator inlet. ## Claims ### Claim 1 A bleed air valve, comprising: a housing that includes an inlet at a first end, an outlet at a second end, and a center portion between the inlet and the outlet to selectively provide a pneumatic flow path between the inlet and the outlet via a passage in the center portion; a piston that moves along a center guide, where the piston includes a first piston surface and an opposing second piston surface, and the piston moves along the center guide in response to forces applied to the first piston surface and the second piston surface, where the piston is spring biased to an open position such that the inlet and the outlet are in fluid communication; a pressure regulator valve that comprises a spring loaded poppet valve that includes a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regulator piston by a regulator spring to provide a regulated output pressure at a pressure regulator outlet that is in fluid communication with the piston first surface; a valve spring that applies a force to the first piston surface to spring bias the bleed air valve to the open position; and a solenoid valve that receives a command signal and in response provides compressed air to the pressure regulator inlet via a solenoid valve outlet that is in fluid communication with the pressure regulator inlet. ### Claim 2 (depends on 1) The bleed air valve of claim 1, where the solenoid valve receives gas turbine engine compressor discharge pressure P3 such that when the solenoid valve receives the command signal to close the solenoid valve provides ambient pressure to the solenoid valve outlet. ### Claim 3 (depends on 1) The bleed air valve of claim 1, where the center guide is axially aligned with the inlet and the outlet. ### Claim 4 (depends on 1) The bleed air valve of claim 1, where the pressure regulator valve is integral with the housing. ### Claim 5 (depends on 1) The bleed air valve of claim 1, wherein the solenoid valve is operable between an energized condition and a deenergized condition and wherein, in the energized condition, the solenoid valve is closed so as to provide ambient air pressure to the pressure regulator inlet. ### Claim 6 (depends on 5) The bleed air valve of claim 5, wherein, in the deenergized condition, the solenoid valve is open so as to provide compressor discharge pressure (P3) to the pressure regulator inlet. ### Claim 7 (depends on 1) The bleed air valve of claim 1, further comprising an aperture extending through the housing, the aperture providing bleed air valve inlet pressure (P2.9) to the second piston surface. ### Claim 8 A bleed air valve, comprising: a housing that includes an inlet at a first end, an outlet at a second end, and a center portion between the inlet and the outlet to selectively provide a pneumatic flow path between the inlet and the outlet via a passage in the center portion; a piston that moves along a center guide, where the piston includes a first piston surface and an opposing second piston surface, and the piston moves along the center guide in response to forces applied to the first piston surface and the second piston surface, where the piston is spring biased to an open position such that the inlet and the outlet are in fluid communication; a pressure regulator valve that includes a spring loaded poppet valve comprising a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regular piston by a regulator spring to provide a regulated output pressure at a pressure regulator outlet that is in fluid communication with the first piston surface; and a control valve that receives a command signal and in response to a first condition of the command signal provides compressed air to the pressure regulator inlet via a control valve output that is in fluid communication with the pressure regulator inlet, and in response to a second condition of the command signal provides ambient air to the pressure regulator inlet via the control valve output. ### Claim 9 (depends on 8) The bleed air valve of claim 8, further comprising a spring that applies a force to the first piston surface. ### Claim 10 (depends on 8) The bleed air valve of claim 8, where the control valve comprises an electromechanical valve. ### Claim 11 An aircraft gas turbine engine bleed air valve, comprising: a housing that includes an inlet at a first end, an outlet at a second end, and a center portion between the inlet and the outlet to selectively provide a pneumatic flow path between the inlet and the outlet via a passage in the center portion; a piston that axially moves along a center guide, where the piston includes a first piston surface and an opposing second piston surface, and the piston axially moves along the center guide in response to forces applied to the first piston surface and the second piston surface, where the piston is spring biased to an open position such that the inlet and the outlet are in fluid communication; a pressure regulator valve that comprises a spring loaded poppet valve that includes a pressure regulator inlet that receives an inlet pressure which is regulated based upon force applied to a pressure regulator piston by a regulator spring to provide a regulated output pressure at a pressure regulator outlet that is in fluid communication with the piston first surface; an electromechanical valve that selectively provides one of ambient air or compressed air to the pressure regulator inlet via an electromechanical valve outlet that is in fluid communication with the pressure regulator inlet; and a spring that applies a force to the first piston surface to spring bias the aircraft gas turbine engine bleed air valve to the open position to bleed compressor air to ambient. ### Claim 12 (depends on 11) The aircraft gas turbine engine bleed valve of claim 11, where the electromechanical valve receives gas turbine engine compressor discharge pressure (P3) and when the electromechanical valve receives a command signal to close the electromechanical valve provides ambient pressure to the electromechanical valve outlet. ### Claim 13 (depends on 11) The aircraft gas turbine engine bleed valve of claim 11, where the center guide is axially aligned with the inlet and the outlet. ### Claim 14 (depends on 11) The aircraft gas turbine engine bleed valve of claim 11, where the pressure regulator is integral with the housing.